html
<!DOCTYPE html>  
<html>  
<head>  
    <style type="text/css" >  
        h3 {  
            color: blue;  
            font-size: 20px;  
        }  
        td {  
            color: green;  
            font-size: 15px;  
        }  
        option {  
            color: purple;  
            font-size: 15px;  
        }  
    </style>  
</head>  
<body>  
    <h3>这是一个标题</h3>  
    <table>  
        <tr>  
            <td>单元格内容</td>  
        </tr>  
    </table>  
    <select>  
        <option>选项1</option>  
        <option>选项2</option>  
    </select>  
</body>  
</html>